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<p>Printed Circuit Boards (PCBs) are fundamental to the electronics industry. The quality of cemented carbide microdrills plays a critical role in the accuracy and reliability of PCB hole-making. The edge preparation process is crucial, as it mitigates edge defects, reduces tool sharpness, prolongs tool life, and improves the surface finish of the workpiece. In this study, the Shear Thickening Polishing (STP) and Electrolysis Combined Shear Thickening Polishing (E-STP) methods were utilized to prepare microdrill cutting edges, producing microdrills with certain edge radii. PCB drilling experiments were conducted to analyze the effect of edge radius on the cutting-performance of uncoated microdrills, as well as the influence of STP and E-STP pretreatment techniques on the cutting-performance of Physical Vapor Deposition (PVD) TiAlSiN coated microdrills. The original microdrill cutting edges exhibited prominent notches and extensive grinding marks. Microdrills prepared using both the STP and E-STP methods displayed smooth, straight edges without grinding marks, resulting in significant improvements in hole position accuracy (252%) and wear resistance (31.7%). Both edge wear and edge radius influence the maximum drilling force and instantaneous drilling temperature, with a microdrill possessing a 4.6&#xa0;μm edge radius demonstrating the lowest drilling temperature and force. While coatings contribute to improved microdrill performance, the E-STP method causes the loss of the Co binder in the coated microdrill substrate, ultimately affecting wear, cutting force, and heat generation. Overall, STP presents a promising approach for microdrill cutting edge preparation, offering substantial improvements in cutting-performance and paving the way for significant advancements in the field of micro-machining.</p>

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Drilling Performance of Cemented Carbide Microdrill Cutting Edges Prepared by Shear Thickening Polishing

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Mingfeng Ke,
  • Yu Zhou,
  • Yuyang Chen,
  • Fenglang Wang,
  • Dangwei Li,
  • Lanying Shao,
  • Jiahuan Wang,
  • Binghai Lyu

摘要

Printed Circuit Boards (PCBs) are fundamental to the electronics industry. The quality of cemented carbide microdrills plays a critical role in the accuracy and reliability of PCB hole-making. The edge preparation process is crucial, as it mitigates edge defects, reduces tool sharpness, prolongs tool life, and improves the surface finish of the workpiece. In this study, the Shear Thickening Polishing (STP) and Electrolysis Combined Shear Thickening Polishing (E-STP) methods were utilized to prepare microdrill cutting edges, producing microdrills with certain edge radii. PCB drilling experiments were conducted to analyze the effect of edge radius on the cutting-performance of uncoated microdrills, as well as the influence of STP and E-STP pretreatment techniques on the cutting-performance of Physical Vapor Deposition (PVD) TiAlSiN coated microdrills. The original microdrill cutting edges exhibited prominent notches and extensive grinding marks. Microdrills prepared using both the STP and E-STP methods displayed smooth, straight edges without grinding marks, resulting in significant improvements in hole position accuracy (252%) and wear resistance (31.7%). Both edge wear and edge radius influence the maximum drilling force and instantaneous drilling temperature, with a microdrill possessing a 4.6 μm edge radius demonstrating the lowest drilling temperature and force. While coatings contribute to improved microdrill performance, the E-STP method causes the loss of the Co binder in the coated microdrill substrate, ultimately affecting wear, cutting force, and heat generation. Overall, STP presents a promising approach for microdrill cutting edge preparation, offering substantial improvements in cutting-performance and paving the way for significant advancements in the field of micro-machining.